Add tests for rmdir.

I also adjusted error message to conform to GNU implementation.

Makefile

@@ -187,6 +187,7 @@ TEST_PROGS  := \
   readlink \
   realpath \
   rm \
+  rmdir \
   seq \
   sort \
   split \

src/rmdir/rmdir.rs

@@ -118,7 +118,7 @@ fn remove_dir(path: &Path, ignore: bool, verbose: bool) -> Result<(), i32> {
             _ => (),
         }
     } else if !ignore {
-        show_error!("failed to remove '{}' Directory not empty", path.display());
+        show_error!("failed to remove '{}': Directory not empty", path.display());
         r = Err(1);
     }
 

test/common/util.rs

@@ -68,6 +68,10 @@ pub fn mkdir(dir: &str) {
     fs::create_dir(Path::new(dir)).unwrap();
 }
 
+pub fn mkdir_all(dir: &str) {
+    fs::create_dir_all(Path::new(dir)).unwrap();
+}
+
 pub fn make_file(name: &str) -> File {
     match File::create(Path::new(name)) {
         Ok(f) => f,

test/rmdir.rs

@@ -0,0 +1,114 @@
+extern crate libc;
+
+use std::process::Command;
+use util::*;
+
+static PROGNAME: &'static str = "./rmdir";
+
+#[path = "common/util.rs"]
+#[macro_use]
+mod util;
+
+#[test]
+fn test_rmdir_empty_directory_no_parents() {
+    let dir = "test_rmdir_empty_no_parents";
+
+    mkdir(dir);
+    assert!(dir_exists(dir));
+
+    let result = run(Command::new(PROGNAME).arg(dir));
+    assert_empty_stderr!(result);
+    assert!(result.success);
+
+    assert!(!dir_exists(dir));
+}
+
+#[test]
+fn test_rmdir_empty_directory_with_parents() {
+    let dir = "test_rmdir_empty/with/parents";
+
+    mkdir_all(dir);
+    assert!(dir_exists(dir));
+
+    let result = run(Command::new(PROGNAME).arg("-p").arg(dir));
+    assert_empty_stderr!(result);
+    assert!(result.success);
+
+    assert!(!dir_exists(dir));
+}
+
+#[test]
+fn test_rmdir_nonempty_directory_no_parents() {
+    let dir = "test_rmdir_nonempty_no_parents";
+    let file = "test_rmdir_nonempty_no_parents/foo";
+
+    mkdir(dir);
+    assert!(dir_exists(dir));
+
+    touch(file);
+    assert!(file_exists(file));
+
+    let result = run(Command::new(PROGNAME).arg(dir));
+    assert_eq!(result.stderr,
+               "rmdir: error: failed to remove 'test_rmdir_nonempty_no_parents': Directory not empty\n");
+    assert!(!result.success);
+
+    assert!(dir_exists(dir));
+}
+
+#[test]
+fn test_rmdir_nonempty_directory_with_parents() {
+    let dir = "test_rmdir_nonempty/with/parents";
+    let file = "test_rmdir_nonempty/with/parents/foo";
+
+    mkdir_all(dir);
+    assert!(dir_exists(dir));
+
+    touch(file);
+    assert!(file_exists(file));
+
+    let result = run(Command::new(PROGNAME).arg("-p").arg(dir));
+    assert_eq!(result.stderr,
+               "rmdir: error: failed to remove 'test_rmdir_nonempty/with/parents': Directory not empty\n\
+               rmdir: error: failed to remove 'test_rmdir_nonempty/with': Directory not empty\n\
+               rmdir: error: failed to remove 'test_rmdir_nonempty': Directory not empty\n");
+    assert!(!result.success);
+
+    assert!(dir_exists(dir));
+}
+
+#[test]
+fn test_rmdir_ignore_nonempty_directory_no_parents() {
+    let dir = "test_rmdir_ignore_nonempty_no_parents";
+    let file = "test_rmdir_ignore_nonempty_no_parents/foo";
+
+    mkdir(dir);
+    assert!(dir_exists(dir));
+
+    touch(file);
+    assert!(file_exists(file));
+
+    let result = run(Command::new(PROGNAME).arg("--ignore-fail-on-non-empty").arg(dir));
+    assert_empty_stderr!(result);
+    assert!(result.success);
+
+    assert!(dir_exists(dir));
+}
+
+#[test]
+fn test_rmdir_ignore_nonempty_directory_with_parents() {
+    let dir = "test_rmdir_ignore_nonempty/with/parents";
+    let file = "test_rmdir_ignore_nonempty/with/parents/foo";
+
+    mkdir_all(dir);
+    assert!(dir_exists(dir));
+
+    touch(file);
+    assert!(file_exists(file));
+
+    let result = run(Command::new(PROGNAME).arg("--ignore-fail-on-non-empty").arg("-p").arg(dir));
+    assert_empty_stderr!(result);
+    assert!(result.success);
+
+    assert!(dir_exists(dir));
+}